RU2338607C1 - Three-roll stand of mill of helical rolling - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: tree-roll stand of mill of helical rolling contains shoe, three drums assembled in shoe, cartridge with working rolls installed in each of three drums, two screw mechanisms of installation of each roll with drive for screw travel, mechanism for equilibrating of shaft in form of driving rod connected to drum with hammer head and mechanism of variation of feed angle of each roll. From the exterior side each drum is equipped with two opposite located lugs which interact with adjusting screws of each roll installation mechanism. A nut of the mechanism is installed on the interior side of the shoe, while an individual drive of adjusting screws travel is secured on the exterior side of the shoe. The driving rod of the roll equilibrating mechanism passes through a piston of hydro-cylinder, secured to the shoe, and is connected with the drum by means of a cylinder axis situated perpendicular to the rod; an end of the rod with a hammer head passes through the cylinder axis, at that supports of each roll are rigidly fixed in the drum cartridge.

EFFECT: there is facilitated upgraded rigidity of stand, upgraded quality of cartridge at high efficiency.

3 dwg

Description

The invention relates to rolling production, and more specifically to the production of pipes on transverse helical rolling mills, and can most effectively be used in three-roll stands, in which it is possible to change both the feed angle and the angle of rolling.

Three-roll stands, in which it is possible to change both the feed angle and the angle of rolling, are technologically more flexible, since they allow you to compensate for errors in the manufacture of calibers, settings and wear of the rolls.

In this case, the main condition is the creation of a rigid stand construction, since only in this case the technological capabilities of obtaining high-quality products are fully realized.

Known three-roll cage of a helical rolling mill containing a bed, three pillows located in the bed with work rolls, two screw installation mechanisms for each roll (ed. Certificate of the USSR No. 152449, B21B 31/24, decl. 28.03.62, published on December 10, 73).

The rolls with their axes are mounted on roller bearings in cups with a spherical outer surface, which provides the required feed and rolling angles.

Each pressure screw is connected to the electric motor through a cylindrical globoidal gearbox. The roll stand installation mechanism has two electric motors, each of which drives the pressure screws on one side of the stand. During the operation of one electric motor, pillows with rolls approach or roll apart on only one side of the mill, which causes a simultaneous change in the rolling angle of all work rolls.

The disadvantage of this three-roll stand is that the presence of spheres on the roll supports adversely affects the stand's performance, its productivity and the quality of the pipes produced, since they are the sources of gaps in the stand due to the intensive wear of the contacting surfaces, which reduce the stand rigidity.

The closest in technical essence is a three-roll stand of a helical rolling mill containing a bed, three drums located in the bed, in which a cassette with work rolls is installed, two screw mechanisms for installing each roll with a drive for moving screws, a balancing mechanism for the roll in the form of a drive rod, associated with the drum with a hammer head, and a mechanism for changing the feed angle of each roll (ed. certificate of the USSR No. 205790, B21B, decl. 07.26.65, publ. 02.12.67).

The pressure screws of the roll mounting mechanism cooperate with spherical bearings mounted on a cassette carrying a roll rigidly mounted in it, articulated from a movable crosshead and provided with guides for movement in the drum cassette. Each traverse has two gears for adjusting the angle of rolling. The drive is common to all screws.

A disadvantage of the known design of the three-roll stand of the helical rolling mill is that it does not have sufficient rigidity, since a large number of movable joints (cassettes with spherical supports - movable crosshead - drum - bed) determines significant gaps that cannot be selected, reduce the accuracy of adjusting the deformation zone and in the presence of dynamic loads reduce the durability and reliability of the main nodes of the stand.

The objective of the present invention is to create a three-roll mill stand for cross-helical rolling, with the ability to change both the feed angle and the angle of rolling and allowing to obtain high-quality pipes (sleeves) at high productivity due to increased rigidity of the stand.

The task is achieved in that in a three-roll stand of a cross-helical rolling mill containing a bed, three drums located in the bed, in each of which a cassette with work rolls is installed, two screw mechanisms for installing each roll with a drive for moving the screws, the roll balancing mechanism in the form the drive rod associated with the drum with a hammer head, and a mechanism for changing the feed angle of each roll, according to the invention, each drum is provided on the outside with two oppositely arranged the bolts with which the setscrews of the roll mounting mechanism interact, the nut of the mechanism mounted on the inner side of the bed, and the individual drive for moving the pressure screws fixed to the outside of the bed, and the drive rod of the balancing mechanism of the roll is passed through the piston of the hydraulic cylinder mounted on the bed and connected to the drum by perpendicular to the thrust of the cylindrical axis through which the end of the thrust with a hammer head is passed, while the supports of each roll are rigidly closed Lena drum in the cassette.

Such a constructive implementation of a three-roll stand of a cross-helical rolling mill having the ability to change both the feed angle and the rolling angle will make it possible to obtain high-quality sleeves (pipes) at high productivity due to the high rigidity of the stand, since a large number of movable joints adopted for this type are excluded stand, and each roll is rigidly mounted in the drum cassette, and the drum has the ability to adjust in two mutually perpendicular planes to change the feed angle and rolling.

The high rigidity of the structure, the ability to select all the gaps in the roll-drum-nut-bed system allow calibrating with high accuracy and, therefore, obtaining high-quality sleeves (pipes). The greater the rigidity of the stand, the greater the rolling speed may be, since the amplitude of the oscillations of the entire stand with rolls will be smaller and the more accurately the resulting product. The hydraulic balancing mechanism presses the cassette with the rollers to the pressure screws and further to the bed, which creates a single oscillating mass, which includes the cage itself with all the mechanisms. The larger this mass, the smaller the amplitude of the oscillations of the system and the more accurate the pipes and higher productivity.

To explain the inventions, a specific embodiment of the invention is given below with reference to the accompanying drawings, in which:

figure 1 - depicts a three-roll mill stand transverse helical rolling, General view; figure 2 and 3 is the same, cuts.

The three-roll stand of the helical rolling mill comprises a frame 1, three located in the frame of the drum 2 with work rolls 3, each of which is mounted on bearing bearings 4 and 5 on the shaft 6, connected with the drive rotation of the rolls 3 (not shown). Bearing bearings are rigidly mounted in drum 2.

Each drum 2 consists of three parts (see Fig. 3): the middle part is a cassette 7, in which the roll 3 is fixed, the lower 8 and upper 9 parts, made in the form of segments. All three parts (cassette 7 and segments 8 and 9) are connected by an axis 10, which allows the cassette 7 with the roller 3 to rotate relative to the fixed segments 8 and 9 at a certain angle (rolling angle).

Each drum 2 is installed in the guides of the frame 1 with the possibility of translational movement in two mutually perpendicular planes.

The drum 2 of each roll 3 is equipped with two oppositely located tides 11, which interact with the pressure screws 12 of the installation mechanism of the roll. The nut 13 of the installation mechanism is mounted in the housing 14, mounted on the inner side of the bed 1. To ensure translational movement, each screw 12 is spline-connected to the worm wheel 15 of the gearbox 16 connected to the electric motor 17. Individual drive of the pressure screws 12 (gearbox 16, motor 17) fixed on the outside of the bed 1.

The balancing mechanism of the roll 3 is made in the form of a drive rod 18 with a hammer head 19 at one end. The rod 18 is passed through the piston 20 of the hydraulic cylinder 21 fixed to the frame 1 and is connected to the drum 2 by means of a cylindrical axis 22 located perpendicular to the rod 18, through which the end of the rod 18 with the hammer head 19 is passed.

The mechanism for changing the feed angle is made in the form of oppositely located pressure stop 23 and a plunger hydraulic cylinder 24, rigidly mounted on the frame 1. On the cassette 7 there are two oppositely located brackets 25, on which the shoes 27 are pivotally mounted, the flat surface of which interacts with the plunger of the hydraulic cylinder 24 and pressure stop 23.

The rolls are brought together and removed (the solution is changed) using the rolls installation mechanism 3. In synchronous and in-phase operation of the electric motors 17, the roll 3 is moved forward relative to the rolling axis. In this case, the electric motors 17 rotate in one direction.

To change the angle of rolling, the electric motors 17 must synchronously and in-phase rotate in different directions. This moves one pressure screw 12, acts on the tide 11 of the drum 2 and the cassette 7 with the roll 3 is rotated relative to the axis 10 by the angle of rolling.

A change in the rolls solution and the rolling angle can also be made during the rolling process, for example, to reduce the longitudinal difference, and when rolling the ends in order to reduce lateral deformation.

The feed angle is changed simultaneously by moving the stop 23 and the hydraulic cylinder 24. The feed angle can also be changed during the rolling process.

The selection of gaps in each mechanism for installing the rolls is carried out using a hydraulic cylinder 21, which constantly presses the drum 2 to the pressure screws 12 and then to the frame.

The gaps between the cassette 7 and the segments 8 and 9 are selected using the hydraulic cylinder 24, which rotates the drum 2 to the feed angle.

The proposed three-roll mill stand for cross-helical rolling compared to the known ones allows to improve the quality of the sleeves (pipes) and productivity.

Claims (1)

A three-roll stand of a helical rolling mill containing a bed, three drums located in the bed, each of which has a cassette with work rolls, two screw mechanisms for installing each roll with a drive for moving screws, a balancing mechanism for the roll in the form of a drive rod connected with a hammer drum a head, and a mechanism for changing the feed angle of each roll, characterized in that each drum is provided on the outside with two oppositely located tides with which the pressure e screws of the roll mounting mechanism, the nut of the mechanism being installed on the inside of the bed, and the individual drive for moving the pressure screws fixed to the outside of the bed, the drive rod of the roll balancing mechanism is passed through the piston of the hydraulic cylinder mounted on the bed and connected to the drum by means of a cylindrical axis located perpendicular to the rod through which the end of the thrust with a hammer head is passed, while the supports of each roll are rigidly fixed in the drum cassette.

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